US 4,043,133 AGranted

Structure and method of constructing and test-loading pile anchored foundations

OwnerLawrence R. Yeggeinventor

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Abstract

A method of constructing pre-tested concrete pilings and pile caps particularly for use in supporting structures, such as transmission line towers that are subjected to large overturning moments. One or more pile holes are bored, a small diameter sheathing containing one or more steel tendons is inserted and a concrete mixture is poured in the pile hole exterior of the tendon sheathing with the tendons anchored in the bottom of the pile. When the concrete has obtained sufficient strength, the tendon is stressed, thereby testing the tension-carrying capacity of the pile and its surrounding foundation soil. A concrete pile cap is thereafter joined to the pile, the tendons are again stressed and anchored to the pile cap and the tendon sheathing is filled with concrete grout to form a solid post-tensioned foundation that has been pre-tested at a force in excess of its design load.

Claims7

Dependent claims

A method of making a pre-tested anchored foundation structure in which the anchor members carry compressive loads and resist upward loads including the steps of:

boring at least one pile hole into the sub-surface soil;
inserting into each pile hole a sheath containing one or more tendons, said tendons extending from the lower end of said sheath into the bottom end of said pile hole, and extending from the top end of said sheath above the surface of the soil;
forming a pile by pouring a concrete mixture into said hole to the exterior of said sheath, whereby the tendons extending from the lower end of said sheath become anchored to the bottom end of said pile but remain free for movement within said sheath;
mounting a tensioning jack to a jacking pad supported on the soil surface out of bearing engagement with the pile to position the jack in spaced relationship above the top of said pile, and connecting said jack to said tendons extending from the top end of said sheath;
and
actuating said tensioning jack to apply a tension to said tendons, whereby said pile and its surrounding soil is pre-tested to withstand a measured force thus applied, and whereby the soil beneath the bottom surface of said jacking pad is loaded.

3 more elements

Dependencies are inferred from the claim text.